# CVE-2019-1704: Cisco Firepower Threat Defense Software SMB Protocol Preprocessor Detection Engine Denial of Service Vulnerabilities

> Unauthenticated attackers can cause a denial of service in Cisco Firepower Threat Defense via the SMB protocol preprocessor detection engine.

- **Severity:** High 7.5 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 3 May 2019
- **Updated:** 19 Nov 2024
- **Also known as:** GHSA-h552-pj49-gv49

## What is CVE-2019-1704?

CVE-2019-1704 is a high-severity denial of service vulnerability in Cisco Secure Firewall Threat Defense, published on 3 May 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Multiple vulnerabilities in the Server Message Block (SMB) Protocol preprocessor detection engine for Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, adjacent or remote attacker to cause a denial of service (DoS) condition. For more information about these vulnerabilities, see the Details section of this advisory.

Weakness: CWE-400 (Uncontrolled Resource Consumption)

## Which versions are affected by CVE-2019-1704?

It affects 1 product.


Products: Cisco Secure Firewall Threat Defense.

## How do I fix CVE-2019-1704?

No fix has been published for CVE-2019-1704 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-1704 being exploited?

There is no known exploitation of CVE-2019-1704 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Secure Firewall Threat Defense

- [CVE-2024-20412](https://insights.sbomify.com/CVE-2024-20412/): Hardcoded credentials in Cisco Firepower Threat Defense Software (critical 9.3)
- [CVE-2024-20330](https://insights.sbomify.com/CVE-2024-20330/): Memory corruption in Cisco Firepower Threat Defense Software (high 8.6)
- [CVE-2024-20339](https://insights.sbomify.com/CVE-2024-20339/): Cisco Firepower Threat Defense Software for Firepower 2100 Series TLS Denial of Service Vulnerability (high 8.6)
- [CVE-2024-20351](https://insights.sbomify.com/CVE-2024-20351/): Cisco Firepower Threat Defense Software Snort Firewall Denial of Service Vulnerability (high 8.6)
- [CVE-2023-20083](https://insights.sbomify.com/CVE-2023-20083/): Denial of service in Cisco Firepower Threat Defense Software (high 8.6)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-1704 and fix it if it is affected.

What it is: CVE-2019-1704 is a high-severity denial of service vulnerability in Cisco Secure Firewall Threat Defense, published on 3 May 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2019-1704 in the wild and no public exploit code.

Affected product: Cisco Secure Firewall Threat Defense. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2019-1704/ (Markdown: https://insights.sbomify.com/CVE-2019-1704/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-1704
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-1704
- OSV: https://osv.dev/vulnerability/CVE-2019-1704

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From sbomify Insights: https://insights.sbomify.com/CVE-2019-1704/
Summaries are generated and may contain mistakes; the official description above is the record.